Hov Grigoryan

I’m a results-driven Java & Data Engineer with 5+ years of experience building scalable backend systems and data pipelines. I specialize in payment systems, digital banking, and blockchain integrations, delivering high-availability solutions with Java, Spring Boot, AWS, and modern data tooling. I bring a strong focus on financial-grade security standards and cross-functional execution in Agile environments.

Recently at Gameteq, I architected and maintained high-throughput data pipelines processing millions of events daily using Kafka and Apache NiFi. I engineered 10+ Airflow DAGs for scheduled reporting and marketing list generation, improving efficiency by ~40%, and strengthened data reliability with deduplication, backfills, and validation routines across ClickHouse and PostgreSQL. I also applied prompt engineering and Generative AI to automate data investigation for faster incident root-cause analysis, and improved monitoring/alerting across production flows with Graylog.

Before that, I delivered backend capabilities at EPAM for a digital banking platform, designing REST APIs for multi-chain crypto wallets with HSM-based key signing. I implemented idempotent financial endpoints and JWT/OAuth2 authentication with Keycloak to eliminate duplicate-transaction risk, and I integrated blockchain nodes via JSON-RPC while adding caching to cut external API latency by ~30%. I also led a Grails-to-Spring Boot migration, improved deployment time by 50%, and built reactive services with Spring WebFlux plus full-stack features in React JS.